基于3DEC的柴胡栏子金矿全面采矿法残留矿柱稳定性分析  

Stability analysis of the residual pillars left by comprehensive mining in Chaihulanzi Gold Mine based on 3DEC

作　　者：杨晓东 陈宗灵 赵振鹏 徐东 何玉龙 Yang Xiaodong;Chen Zongling;Zhao Zhenpeng;Xu Dong;He Yulong(Chifeng Chaihulanzi Gold Mining Co. ,Ltd.)

机构地区：[1]赤峰柴胡栏子黄金矿业有限公司

出　　处：《黄金》2019年第4期29-34,共6页Gold

基　　金：国家自然科学青年基金项目(51504044);中国博士后科学基金面上项目(2015M570607);重庆市基础科学与前沿技术研究专项一般项目(cstc2016jcyjA 1861)

摘　　要：柴胡栏子金矿全面采矿法采场残留矿柱资源回采过程中面临的关键问题是如何有效地控制岩层的变形和破坏,以及合理调控采场地压。采用3DEC数值模拟软件模拟了无矿柱回采和人工膨胀矿柱替代原生矿柱回采的2种回采方案。模拟结果表明:矿柱的存在极大地改善了上盘围岩的应力状态,与无矿柱开采方案相比较,围岩最大拉应力由0. 861 6 MPa降低为0. 124 57 MPa,围岩最大压应力由9. 509 MPa降低为8. 601 9 MPa,上盘围岩最大下沉量由3. 245 mm降低为1. 514 7 mm,采场顶板未产生塑性区,采场顶板的稳定性较好。工业试验表明:采用人工膨胀矿柱替代原生矿柱的方式回采残留矿柱能够确保回采过程中顶板的安全与稳定,有效地延长了矿山的服务年限,保障矿山可持续发展。The key problems faced by Chaihulanzi Gold Mine are to control the deformation and failure of rock strata and reasonably regulate ground pressure in the recovery process of the residual pillars left by comprehensive mining.2 recovery schemes were simulated with 3DEC numerical software.One is recovery without pillars.The other is original rock pillar replacement by artificial inflation pillars.The results show that the existence of the original rock pillar greatly improves the stress state of the surrounding rock.Compared with the non-pillar mining scheme,the maximum tensile stress of the surrounding rock is reduced from 0.861 6 MPa to 0.124 57 MPa.The maximum compressive stress of the surrounding rock is reduced from 9.509 MPa to 8.601 9 MPa.And the maximum subsidence magnitude of the surrounding rock is reduced from 3.245 mm to 1.514 7 mm.The stope incurs no plastic zone,and the roof stability of the stope is good.Industrial test shows that reserved pillar recovery with the original rock pillar replacement by artificial inflation pillars can ensure the safety and stability of the roof during the mining process,effectively extending the service life and ensuring the sustainable development of the mine.

关 键 词：3DEC 全面采矿法 残矿开采 矿柱稳定性 数值模拟 人工膨胀矿柱 

分 类 号：TD853.32[矿业工程—金属矿开采]